D9862: Don't create 2 msgbox (one of them crashes) when can't change rights.

[Jaime Torres Amate]

jtamate created this revision.
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REVISION SUMMARY
  Copying several files to a file system where the rights can't be
  changed, two dialogs asking for "Retry Skip Skip all Abort" where shown.
  Pressing Skip all crashed dolphin.
  Now only one dialog is shown and no crash pressing skip all.
  Unfortunatly, all the messageboxes saying that the permissions can't
  be changed are shown, but no crash.
  
  CCBUG: 332948

TEST PLAN
  The same as in https://phabricator.kde.org/D9005 and https://phabricator.kde.org/D9829

REPOSITORY
  R244 KCoreAddons

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D9862

AFFECTED FILES
  src/lib/jobs/kjob.cpp

To: jtamate, #frameworks
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